<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

<el-button type="text" @click="openDialogChapter()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}

                <span class="acts">
                    <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}

                <span class="acts">
                    
                    <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                    <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible"  title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
  <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
    <el-form :model="video" label-width="120px">
      <el-form-item label="课时标题">
        <el-input v-model="video.title"/>
      </el-form-item>
      <el-form-item label="课时排序">
        <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
      </el-form-item>
      <el-form-item label="是否免费">
        <el-radio-group v-model="video.free">
          <el-radio :label="true">免费</el-radio>
          <el-radio :label="false">默认</el-radio>
        </el-radio-group>
      </el-form-item>
      <el-form-item label="上传视频">
        <!-- TODO -->
        <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadVideo'"
            :limit="1"
            class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
      </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
      <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
    </div>
  </el-dialog>
  </div>
</template>

<script>
import chapter from "@/api/edu/chapter";
import video from "@/api/edu/video";
export default {
  data() {
    return {
      saveBtnDisabled: false,
      chapterVideoList: [],
      courseId: "",
      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,
      chapter: {
        //封装章节数据
        title: "",
        sort: 0,
      },
      video: {
        title: "",
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName: ''
      },
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    };
  },
  created() {
    //获取路由中的id值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      //根据课程id查询章节和小节
      this.getChapterVideo();
    }
  },
  methods: {
    //上传视频的方法
    handleVodUploadSuccess(response, file, fileList){
        this.video.videoSourceId = response.data.videoId
        this.video.videoOriginalName = file.name //上传视频名称
    },
    handleVodRemove(){
        video.deleteAliVideo(this.video.videoSourceId)
          .then(response => {
              this.$message({
                type: "success",
                message: "删除视频成功！",
              });
              //把文件列表清空
              this.fileList = []
              //清空video的视频id和名称
              this.video.videoSourceId = ' '
              this.video.videoOriginalName = ''
          })
    },
    beforeVodRemove(file, fileList){
      return this.$confirm(`确定删除 ${  file.name}？`)
    },
    handleUploadExceed(){
        this.$message.warning('想要重新上传视频，请先删除已上传的视频！')
    },
    openEditChatper(chapterId) {
      this.dialogChapterFormVisible = true;
      chapter.getChapter(chapterId).then((response) => {
        this.chapter = response.data.chapter;
      });
    },
    addChapter() {
      //设置课程id到chapter对象中
      this.chapter.courseId = this.courseId;
      chapter.addChapter(this.chapter).then((response) => {
        this.dialogChapterFormVisible = false;
        this.$message({
          type: "success",
          message: "添加成功！",
        });
        // 刷新页面
        this.getChapterVideo();
      });
    },
    updateChapter() {
      chapter.updateChapter(this.chapter).then((response) => {
        this.dialogChapterFormVisible = false;
        this.$message({
          type: "success",
          message: "修改成功",
        });
        // 刷新页面
        this.getChapterVideo();
      });
    },
    saveOrUpdate() {
      if (!this.chapter.id) {
        this.addChapter();
      } else {
        this.updateChapter();
      }
    },
    openDialogChapter() {
      //表单数据做清空
      this.dialogChapterFormVisible = true;
      this.chapter.title = "";
      this.chapter.sort = 0;
    },
    removeChapter(chapterId) {
      this.$confirm('此操作将永久删除章节, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).then(() => {
                chapter.deleteChapter(chapterId)
                    .then(success =>{
                        this.$message({
                        type: 'success',
                        message: '删除成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo();
                    })
            })
      
    },
    addVideo(){
      this.video.courseId = this.courseId
      video.addVideoInfo(this.video).then((response) => {
        this.dialogVideoFormVisible = false;
        this.$message({
          type: "success",
          message: "添加成功！",
        });
        // 刷新页面
        this.getChapterVideo();
      });
    },
    updateVideo(){
      video.updateVideoInfo(this.video).then((response) => {
        this.dialogVideoFormVisible = false;
        this.$message({
          type: "success",
          message: "修改成功",
        });
        // 刷新页面
        this.getChapterVideo();
      });
    },
    saveOrUpdateVideo(){
      if (!this.video.id) {
        this.addVideo();
      } else {
        this.updateVideo();
      }
    },
    openEditVideo(videoId) {
      this.dialogVideoFormVisible = true;
      video.getVideo(videoId).then((response) => {
        this.video = response.data.video;
      });
    },
    openVideo(chapterId) {
      this.dialogVideoFormVisible = true
      this.video.title= "",
      this.video.sort=0
      this.video.free=0,
      this.video.videoSourceId= ''
      this.video.chapterId = chapterId, // 设置章节ID
      this.fileList = []
    },
    removeVideo(videoId) {
      this.$confirm('此操作将永久删除小节, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).then(() => {
                video.deleteVideo(videoId)
                    .then(success =>{
                        this.$message({
                        type: 'success',
                        message: '删除成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo();
                    })
            })
    },
    //根据课程id查询章节和小节
    getChapterVideo() {
      chapter.getAllChapterVideoInfo(this.courseId).then((response) => {
        this.chapterVideoList = response.data.list;
      });
    },
    previous() {
      this.$router.push({ path: "/course/info/" + this.courseId });
    },
    next() {
      this.$router.push({ path: "/course/publish/" + this.courseId });
    },
  },
};
</script>
<style scoped>
.chanpterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chanpterList li {
  position: relative;
}
.chanpterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chanpterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>